`threading_example` allow on Darwin

examples/demo/demo.odin

@@ -1107,11 +1107,6 @@ prefix_table := [?]string{
 }
 
 threading_example :: proc() {
-	if ODIN_OS == .Darwin {
-		// TODO: Fix threads on darwin/macOS
-		return
-	}
-
 	fmt.println("\n# threading_example")
 
 	{ // Basic Threads